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(PHP 4 >= 4.2.0)
domxml_open_mem — Creates a DOM object of an XML document
The function parses the XML document in the given string.
The contents of the XML file.
This optional parameter can be used to change the behavior of this function.
You can use one of the following constants for it: DOMXML_LOAD_PARSING (default), DOMXML_LOAD_VALIDATING or DOMXML_LOAD_RECOVERING. You can add to it also DOMXML_LOAD_DONT_KEEP_BLANKS, DOMXML_LOAD_SUBSTITUTE_ENTITIES and DOMXML_LOAD_COMPLETE_ATTRS by bitwise or.
If used, it will contain the error messages. error must be passed in by reference.
Returns a DomDocument instance of the given XML contents.
| Version | Beschreibung |
|---|---|
| 4.3.0 | The mode and error parameters were added. |
Beispiel #1 Opening an XML document in a string
<?php
include("example.inc");
if (!$dom = domxml_open_mem($xmlstr)) {
echo "Error while parsing the document\n";
exit;
}
$root = $dom->document_element();
?>
It's always nice to see just where in the XML the error is so I've enhanced the error message example above to this:
// Read and parse dynamic PHP/XML document.
ob_start();
require($_REQUEST['page'].'.php');
$xml = ob_get_contents();
ob_end_clean();
$xmldoc = domxml_open_mem("<?xml version='1.0' encoding='ISO-8859-1'?>".$xml, DOMXML_LOAD_PARSING, $error);
// Show error.
if(!$xmldoc) {
// Assign each line to array.
$arXML = explode("\n", $xml);
echo "<pre>";
foreach ($error as $errorline) {
echo $errorline['errormessage'].
"Node: ".$errorline['nodename']."\n".
"Line: ".$errorline['line']."\n".
"Column: ".$errorline['col']."\n";
// Locate actual line number.
$arErrorMessage = explode(' line ', $errorline['errormessage']);
$arErrorMessage = explode(' ', $arErrorMessage[1]);
$errorLineNumber = $arErrorMessage[0];
// Show +/- 10 lines around error.
$minErrorLineNumber = max(0, $errorLineNumber-10);
$maxErrorLineNumber = min(sizeof($arXML), $errorLineNumber+10);
echo "XML snip (linies: ".$minErrorLineNumber." to ".$maxErrorLineNumber."):\n";
for($n = $minErrorLineNumber; $n < $maxErrorLineNumber; $n++)
if($n == $errorLineNumber)
echo "<B>".htmlentities($arXML[$n])."</B>\n";
else
echo htmlentities($arXML[$n])."\n";
echo "\n\n";
}
echo "</pre>";
}
This will actually render +/- 10 lines around the actual error. Hope others will find this usefull aswell.
Regarding the 'magic_quotes_runtime = On' issue in XML parsing, I will suggest using the method below, for those who do not want to turn off the setting in the configuration file.
<?php
$original-magic-quotes-runtime-value = get_magic_quotes_runtime();
set_magic_quotes_runtime(0);
your-xml-parsing-codes();
set_magic_quotes_runtime($original-magic-quotes-runtime-value);
?>
Careful, this function will not work with XML documents which are in UTF-16 or UTF-32 encoding and include a BOM at the beginning, so your code will need a special handling for these encodings.
A recursive function that parses XML into objects:
<?php
$xmlstg = '<?xml version="1.0"?';
$xmlstg .= '><candy><anatomically_shaped><head_to_bite_off>chocolate bunnies</head_to_bite_off><headless>gummi worms</headless></anatomically_shaped></candy>';
$dom = domxml_open_mem($xmlstg);
$root = $dom->document_element();
$root->name = '$candy';
function parse_node($node) {
global $candy;
if ($node->has_child_nodes()) {
foreach($node->child_nodes() as $n) {
if ($n->node_name() == '#text') {
eval("$node->name=\"" . $n->node_value() . "\";");
}
else {
$n->name = $node->name . '->' . $n->node_name();
parse_node($n);
}
}
}
}
parse_node($root);
echo $candy->anatomically_shaped->head_to_bite_off;
// echos "chocolate bunnies"
?>
There is some interesting feature with "magic_quotes_runtime" ini directive and "domxml_open_mem" function.
If we have "magic_quotes_runtime=on" in out php.ini file, this code generates many warning
$xml_str = file_get_contents($xml_file));
$Document = domxml_open_mem($xml_str));
if "magic_quotes_runtime=off" all is good.
The DOM XML parser does not automatically free memory when a DomDocument goes out of scope.
If you're using the DOM parser to parse several XML files as part of a long running script, you must free the DomDocument manually or a memory leak will occur.
To free a DOM document allocated by domxml_open_mem, do the following:
$doc = domxml_open_mem("$contents");
$doc->free();
Finally figured out the error handling. The sample below will give a nice error message. Should also work for domxml_open_file.
<?
# Small sample xml file with 2 errors
# 1. root tag not closed
# 2. Missing ; in &
$xml = "<root>&";
$xmldoc = @domxml_open_mem($xml,DOMXML_LOAD_PARSING,$error);
echo "<pre>"; # Just for nice layout
foreach ($error as $errorline) { # Loop through all errors
echo $errorline['errormessage'];
echo " Node : " . $errorline['nodename'] . "\n";
echo " Line : " . $errorline['line'] . "\n";
echo " Column : " . $errorline['col'] . "\n\n";
}
?>
You can also create a new DomDocument instance by calling its constructor:
<?php
$doc = new DomDocument($xml);
?>
where $xml is any string of well-formed XML.
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